usage: a representation of a substance using symbols for its constituent elements

5. convention, normal, pattern, rule, formula, practice

usage: something regarded as a normative example; "the convention of not naming the main character"; "violence is the rule not the exception"; "his formula for impressing visitors"

6. formula, milk

usage: a liquid food for infants

7. rule, formula, procedure, process

usage: (mathematics) a standard procedure for solving a class of mathematical problems; "he determined the upper bound with Descartes' rule of signs"; "he gave us a general formula for attacking polynomials"

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